package com.tedu.springboot2302.controller;

import com.tedu.springboot2302.entity.Article;
import com.tedu.springboot2302.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

@Controller
public class ArticleController {
    private static File articleDir;

    static {
        articleDir = new File("./articles");
        if (!articleDir.exists()) {
            articleDir.mkdirs();
        }
    }

    @RequestMapping("/writeArticle")
    public void writeArticle(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("开始处理发表文章");

        //1获取表单信息
        String title = request.getParameter("title");
        String author = request.getParameter("author");
        String content = request.getParameter("content");
        System.out.println(title + "," + author + "," + content);
        //必要的验证
        if (title == null || title.isEmpty() ||
                author == null || author.isEmpty() ||
                content == null || content.isEmpty()) {
            try {
                response.sendRedirect("/article_info_error.html");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return;
        }

        //保存文章数据
        Article article = new Article(title, author, content);
        File file = new File(articleDir, title + ".obj");

        if (file.exists()) {
            try {
                response.sendRedirect("/article_fail.html");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return;
        }

        try (
                FileOutputStream fos = new FileOutputStream(file);
                ObjectOutputStream oos = new ObjectOutputStream(fos);
        ) {
            oos.writeObject(article);
            response.sendRedirect("/article_success.html");
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


    @RequestMapping("/articleList")
    public void articleList(HttpServletRequest request, HttpServletResponse response) {
        List<Article> articleList = new ArrayList<>();
        File[] subs = articleDir.listFiles(f -> f.getName().endsWith(".obj"));
        for (File sub : subs) {
            try (
                    FileInputStream fis = new FileInputStream(sub);
                    ObjectInputStream ois = new ObjectInputStream(fis);
            ) {
                Article article = (Article) ois.readObject();
                articleList.add(article);
            } catch (IOException | ClassNotFoundException e) {
                e.printStackTrace();
            }
        }

        try {
            response.setContentType("text/html;charset=utf-8");
            PrintWriter pw = response.getWriter();
            pw.println("<!DOCTYPE html>");
            pw.println("<html lang=\"en\">");
            pw.println("<head>");
            pw.println("<meta charset=\"UTF-8\">");
            pw.println("<title>Title</title>");
            pw.println("</head>");
            pw.println("<body>");

            pw.println("<center>");
            pw.println("<h1>文章列表</h1>");
            pw.println("<table border='3'>");
            pw.println("<tr>");
            pw.println("<td>标题</td>");
            pw.println("<td>作者</td>");
            pw.println("</tr>");

            for (Article article : articleList){
                pw.println("<tr>");
                pw.println("<td>"+article.getTitle()+"</td>");
                pw.println("<td>"+article.getAuthor()+"</td>");
                pw.println("</tr>");
            }

            pw.println("</table>");
            pw.println("</center>");

            pw.println("</body>");
            pw.println("</html>");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
